I have winter camped at Punderson State Park many times in Newbury, OH. The temperature one time was sub-zero and I was still warm. I have an electric heater I keep on the counter near the stove when it is real cold that I set at 70-75 and I keep the TM heater between 65-70. The TM heater rarely comes on during temps 30 or above while using the electric heater and of course that saves on propane as well.
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